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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
257 Allen Magnum progress continues to another level...
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<blockquote data-quote="Fiftydriver" data-source="post: 57554" data-attributes="member: 10"><p>Sako 7STW,</p><p></p><p>IT is built on a modified 338 RUM case. Full length, necked down to 257 with the shoulder angle sharpened and body taper blown out.</p><p></p><p>Admittedly this case is far to large for the 257 bore with conventional bullet weights. A 100 gr ballistic Tip would be about worthless over a 100 gr capacity.</p><p></p><p>It is for this reason that Wildcat Bullets has designed several new bullet to perform in this very large case. THe light weight pill is teh 130 gr Bonded Core FBHP. It has a B.C. of .550 and a S.D. of .281. </p><p></p><p>Substantially more B.C. then a 180 gr .308" Accubond and a S.D. exactly the same as a 225 gr .338" bullet. Performance goals are to drive thsi bullet to at least 3600 fps.</p><p></p><p>The other bullet weights are a 145 gr FBSP built on a very heavy tapered jacket and a 145 gr ULD rebated Boattail HP with a B.C. of .738!</p><p></p><p>There will also be a 150 gr BCFBHP and possibly a 160 gr BCFBHP.</p><p></p><p>I used this case because it has proven to be stronger in the case head then the STW case as well as not having to deal with the inconsistant belt thicknesses with the STW in a tight chambered rifle.</p><p></p><p>Not to mention the 16% larger case capacity which should offer at least 125 to 150 fps over the 257 STW with same bullet weights.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 57554, member: 10"] Sako 7STW, IT is built on a modified 338 RUM case. Full length, necked down to 257 with the shoulder angle sharpened and body taper blown out. Admittedly this case is far to large for the 257 bore with conventional bullet weights. A 100 gr ballistic Tip would be about worthless over a 100 gr capacity. It is for this reason that Wildcat Bullets has designed several new bullet to perform in this very large case. THe light weight pill is teh 130 gr Bonded Core FBHP. It has a B.C. of .550 and a S.D. of .281. Substantially more B.C. then a 180 gr .308" Accubond and a S.D. exactly the same as a 225 gr .338" bullet. Performance goals are to drive thsi bullet to at least 3600 fps. The other bullet weights are a 145 gr FBSP built on a very heavy tapered jacket and a 145 gr ULD rebated Boattail HP with a B.C. of .738! There will also be a 150 gr BCFBHP and possibly a 160 gr BCFBHP. I used this case because it has proven to be stronger in the case head then the STW case as well as not having to deal with the inconsistant belt thicknesses with the STW in a tight chambered rifle. Not to mention the 16% larger case capacity which should offer at least 125 to 150 fps over the 257 STW with same bullet weights. Good Shooting!! Kirby Allen(50) [/QUOTE]
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257 Allen Magnum progress continues to another level...
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